HW1 (Note: this problem is an extension of the Lab Problem1): You have been give

ID: 3593874 • Letter: H

Question

HW1 (Note: this problem is an extension of the Lab Problem1):

You have been given PhoneRecord.java and PhoneDirectory_HW.java.

Phonedirectory_HW.java has 6 methods:

removeNumber------- has been given already

displayRecords------- has been given already

addNumber ------you need to write the code for it

removeNumberWithSameZipCode ------you need to write the code for it

findNumber ------you need to write the code for it

displayRecordsWithSameLastName ------you need to write the code for it

The two methods, removeNumber and displayRecords has already completed. You need to complete the remaining 4 methods. Here is a sample output that we expect to see from your program (of course, if the user’s inputs are different, the results will be different from the sample output). Note: you don't need to handle the case where two or more people have the same phone number. Each method is worth 1 point. Submit only the PhoneDirectory_HW.java file.

Phone directory commands:

a - Add a new phone number

d - Display All

da -Display all with same Last Name

f - Find a phone number

r - Remove a phone number

rc -Remove all records with same zip code

q – Quit

Enter command (a, d, da, f, r, rc or q): a

Enter first name: nick

Enter last name: keller

Enter phone number: 12345

Enter zip code: 121212

1 record added. Total Records: 1

Enter command (a, d, da, f, r, rc or q): a

Enter first name: sarah

Enter last name: keler

Enter phone number: 12345

Enter zip code: 121212

1 record added. Total Records: 2

Enter command (a, d, da, f, r, rc or q): a

Enter first name: richard

Enter last name: keller

Enter phone number: 1233939

Enter zip code: 121212

1 record added. Total Records: 3

Enter command (a, d, da, f, r, rc or q): f

Enter name to look up: keller

Enter command (a, d, da, f, r, rc or q): f

Enter name to look up: ri

richard keller 1233939 121212

Enter command (a, d, da, f, r, rc or q): dl

Command was not recognized; please enter only a, d, da, f, r, rc or q.

Enter command (a, d, da, f, r, rc or q): da

Enter the last name: richardson

Enter command (a, d, da, f, r, rc or q): da

Enter the last name: keller

nick keller 12345 121212

richard keller 1233939 121212

Enter command (a, d, da, f, r, rc or q): r

Enter phone no:

The phone no do not exist.

Enter command (a, d, da, f, r, rc or q): d

1. nick keller 12345 121212

2. sarah keler 12345 121212

3. richard keller 1233939 121212

Enter command (a, d, da, f, r, rc or q): r

Enter phone no:

12345

Record with phone no: 12345 deleted.

Enter command (a, d, da, f, r, rc or q): d

1. sarah keler 12345 121212

2. richard keller 1233939 121212

Enter command (a, d, da, f, r, rc or q): a

Enter first name: Frank

Enter last name: Underwood

Enter phone number: 435

Enter zip code: 20500

1 record added. Total Records: 3

Enter command (a, d, da, f, r, rc or q): d

1. sarah keler 12345 121212

2. richard keller 1233939 121212

3. Frank Underwood 435 20500

Enter command (a, d, da, f, r, rc or q): a

Enter first name: claire

Enter last name: underwood

Enter phone number: 435

Enter zip code: 20500

1 record added. Total Records: 4

Enter command (a, d, da, f, r, rc or q): d

1. sarah keler 12345 121212

2. richard keller 1233939 121212

3. Frank Underwood 435 20500

4. claire underwood 435 20500

Enter command (a, d, da, f, r, rc or q): rc

Enter zip code:20500

No of records deleted: 2. Remaining Records: 2

Enter command (a, d, da, f, r, rc or q): d

1. sarah keler 12345 121212

2. richard keller 1233939 121212

HW2:

You have been given ArrayManipulation.java. You will implement 4 method bodies in ArrayManipulation.java:

createTwoDArray

rotateRowOnce

frequency

SwapRow

The meaning of each method is given before the method header in ArrayManipulation.java. For your testing purpose, we also provide an ArrayTest class (ArrayTest.java) that you may use to test your ArrayManipulation.java. With this ArrayTest program, you should see the following output. Note that we will use different arrays to test your implementation when grading your implementation. Submit only the ArrayManipulation.java file. We will use our own ArrayTest to test your ArrayManipulation class when grading your submission.

{7,7,5,6,0,6,9,3,2,0,4,3}

{{7, 7, 5, 6},

{0, 6, 9, 3},

{2, 0, 4, 3}}

{{7, 7, 5},

{6, 0, 6},

{9, 3, 2},

{0, 4, 3}}

error -- the array is null

error

{{9, 0, 6, 9},

{4, 6, 0, 4},

{5, 1, 7, 2}}

{{9, 9, 0, 6},

{4, 6, 0, 4},

{5, 1, 7, 2}}

{{9, 9, 0, 6},

{4, 6, 0, 4},

{2, 5, 1, 7}}

{{9, 9, 0, 6},

{4, 6, 0, 4},

{2, 5, 1, 7}}

frequency =2

frequency =0

frequency =1

error

{{9, 9, 0, 6},

{4, 6, 0, 4},

{2, 5, 1, 7}}

{{2, 5, 1, 7},

{4, 6, 0, 4},

{9, 9, 0, 6}}

{{4, 6, 0, 4},

{2, 5, 1, 7},

{9, 9, 0, 6}}

import java.util.Scanner;

public class PhoneDirectory_HW {
   // Class variables
   static PhoneRecord[] records = new PhoneRecord[50];
   static int recordCount = 0;
   static Scanner sc ;

public static void main(String[] args) {

       // Display list of commands
       System.out.println("Phone directory commands: "
               + " a - Add a new phone number "
               + " d - Display All "
               + " da -Display all with same Last Name "
               + " f - Find a phone number "
               + " r - Remove a phone number "
               + " rc -Remove all records with same zip code "
               + " q - Quit ");

       // Read and execute commands
       while (true) {
           sc= new Scanner(System.in);

           // Prompt user to enter a command
           System.out.print("Enter command (a, d, da, f, r, rc or q): ");
           String command = sc.nextLine();

           // Determine whether command is "a", "f", "q", or
           // illegal; execute command if legal.
           if (command.equalsIgnoreCase("a")) {

               // Command is "a". Call addNumber to add a new
               // name and number to the database
               addNumber();
           } else if (command.equalsIgnoreCase("f")) {

               // Command is "f". Call findNumber to find phone
               // numbers that match the user's criteria.
               findNumber();
           } else if (command.equalsIgnoreCase("d")) {

               // Command is "d". Call displayRecords to display all phone
               // numbers
               displayRecords();
           }else if (command.equalsIgnoreCase("da")) {

               // Command is "d". Call displayRecords to display all phone
               // numbers
               displayRecordsWithSameLastName();
           }
           else if (command.equalsIgnoreCase("r")) {

               // Command is "r". Call removeNumber to remove phone
               // numbers that match the user's criteria.
               removeNumber();
           }else if (command.equalsIgnoreCase("rc")) {

               // Command is "r". Call removeNumber to remove phone
               // numbers that match the user's criteria.
               removeNumberWithSameZipCode();
           }
           else if (command.equalsIgnoreCase("q")) {

               // Command is "r". Call removeNumber to remove phone
               // numbers that match the user's criteria.
               break;
           }
           else {

               // Command is illegal. Display error message.
               System.out.println("Command was not recognized; "
                       + "please enter only a, d, da, f, r, rc or q.");
           }

           System.out.println();
       }
   }
   private static void addNumber() {
//this method adds a phone record, ie. first name, lastname,
//phone number and zipcode

   }

   private static void removeNumber() {
       //this code removes a phone no.
               System.out.println("Enter phone no:");
               String pFind = sc.next();
               int index = 0;
               boolean found = true;
               for(int i=0;i<recordCount;i++){
                   if(records[i].getNumber().equals(pFind))
                   {
                       index =i;
                       for(int j=index;j<recordCount;j++){
                           records[j]=records[j+1];
                       }
                       System.out.println("Record with phone no: "+ pFind+" deleted.");
                       records[recordCount-1]=null;
                       recordCount--;
                       found = true;
                   }
                   else
                   {
                       found = false;
                   }

               }
               if(!found)
                   System.out.println("The phone no do not exist.");


   }

   private static void displayRecords() {
       for (int i = 0; i < recordCount; i++) {
           System.out.println(i + 1 + ". " + records[i].getName() + " "
                   + records[i].getNumber()+" "+records[i].getZipCode());
       }
   }



   private static void removeNumberWithSameZipCode() {
       // your code here
   }

   // use PhoneRecord getName() method in conjunction with startsWith(String prefix) String method, see:
   // http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#startsWith%28java.lang.String%29
   private static void findNumber() {
       // your code here
   }

   private static void displayRecordsWithSameLastName(){
       // your code here

}

public class ArrayManipulation {

   /** given a 1-D array return a 2-D array
   * For example: int[] array = {1, 2, 3, 4, 5, 6}, numRows = 2
   * return {{1, 2, 3}, {4, 5, 6}}
   * if the array can't be evenly divided by numRows, then return null
   */
   public static int[][] createTwoDArray( int[] array, int numRows){
       // implement
   }

   /** int[row][column] array
   * rotate row = indexOfRowToRotate once. If a row is composed of numbers:
   * {1, 4, 9, 8}, then after one rotation it is {8, 1, 4, 9}
   * If the indexOfRowToRotate is out of boundary, print error and do nothing
   */
   public static void rotateRowOnce( int[][] array, int indexOfRowToRotate){
       // implement
   }

   /**
   * return the number of occurrence of the given integer in the array
   */
   public static int frequency( int[][] array, int integer){
       // implement
   }

   // swap the two rows of the 2D array and return the resulting array
   // If rowOne or rowTwo is out of boundary, or if rowOne is the same as rowTwo, print error and do nothing
   public static void swapRow( int[][] array, int rowOne, int rowTwo){
       // implement
   }

   // may be helpful for debugging
   public static void display2DArray( int[][] array){
       if (array == null){
           System.out.println("error -- the array is null");
           return;
       }
       System.out.print("{");
       for (int i = 0; i < array.length; i++){
           System.out.print("{");
           for (int k = 0; k < array[0].length - 1; k++){
               System.out.print( array[i][k] + ", ");
           }
           System.out.print( array[i][array[0].length - 1] + "}");
           if (i != (array.length - 1)){
               System.out.print(", ");
           }
       }
       System.out.print("} ");
   }

   public static void display1DArray(int[] array){
       if (array == null){
           System.out.println("error -- the array is null");
           return;
       }
       System.out.print("{");
       for (int i = 0; i < array.length - 1; i++){
           System.out.print(array[i] + ",");
       }
       System.out.print(array[array.length - 1]);
       System.out.print("} ");
   }
}

public class ArrayTest {
   public static int[][] arrayTwoSmall = {{9, 0, 6, 9},
                                       {4, 6, 0, 4},
                                       {5, 1, 7, 2}};
   public static int[] arrayOneSmall = {7, 7, 5, 6, 0, 6, 9, 3, 2, 0, 4, 3};

   public static void main(String[] args) {
       ArrayManipulation.display1DArray(arrayOneSmall);
       ArrayManipulation.display2DArray( ArrayManipulation.createTwoDArray( arrayOneSmall, 3));
       ArrayManipulation.display2DArray( ArrayManipulation.createTwoDArray( arrayOneSmall, 4));
       ArrayManipulation.display2DArray( ArrayManipulation.createTwoDArray( arrayOneSmall, 5));

       ArrayManipulation.rotateRowOnce( arrayTwoSmall, 6);
       ArrayManipulation.display2DArray(arrayTwoSmall);
       ArrayManipulation.rotateRowOnce( arrayTwoSmall, 0);
       ArrayManipulation.display2DArray(arrayTwoSmall);
       ArrayManipulation.rotateRowOnce( arrayTwoSmall, 2);
       ArrayManipulation.display2DArray(arrayTwoSmall);

       ArrayManipulation.display2DArray( arrayTwoSmall );
       System.out.println("frequence ="+ArrayManipulation.frequency(arrayTwoSmall, 6));
       System.out.println("frequence ="+ArrayManipulation.frequency(arrayTwoSmall, -1));
       System.out.println("frequence ="+ArrayManipulation.frequency(arrayTwoSmall, 7));

       ArrayManipulation.swapRow( arrayTwoSmall, 1, 6);
       ArrayManipulation.swapRow( arrayTwoSmall, 1, 1);
       ArrayManipulation.swapRow( arrayTwoSmall, -1, -1);
       ArrayManipulation.display2DArray(arrayTwoSmall);
       ArrayManipulation.swapRow( arrayTwoSmall, 0, 2);
       ArrayManipulation.display2DArray(arrayTwoSmall);
       ArrayManipulation.swapRow( arrayTwoSmall, 0, 1);
       ArrayManipulation.display2DArray(arrayTwoSmall);

}

Explanation / Answer

// File Name: PhoneRecord.java

// Class PhoneRecord definition

public class PhoneRecord

{

// Instance variables to store data

String firstName;

String lastName;

String phoneNumber;

String zipCode;

// Parameterized constructor

PhoneRecord(String fn, String ln, String ph, String zc)

{

firstName = fn;

lastName = ln;

phoneNumber = ph;

zipCode = zc;

}// End of constructor

}// End of class

---------------------------------------------------------------------------------------------------------------------------------------------

// File Name: PhoneDirectory_HW.java

import java.util.*;

public class PhoneDirectory_HW

{

String fName, lName, pn, zp;

// Creates an array of object of class PhoneRecord

PhoneRecord pr[] = new PhoneRecord[50];

// Record counter

int record = 0;

// Scanner class object created to accept data

Scanner sc = new Scanner(System.in);;

// Method to display menu and accept user choice

String menu()

{

String choice;

// Displays menu information

System.out.println(" Phone directory commands: ");

System.out.println(" a - Add a new phone number ");

System.out.println(" d - Display All ");

System.out.println(" da -Display all with same Last Name ");

System.out.println(" f - Find a phone number ");

System.out.println(" r - Remove a phone number ");

System.out.println(" rc -Remove all records with same zip code ");

System.out.println(" q – Quit ");

System.out.println(" Enter command (a, d, da, f, r, rc or q): ");

// Accepts user choice

choice = sc.next();

sc.nextLine();

// Returns user choice

return choice;

}// End of method

// Method to add a phone record

void addNumber()

{

// Accepts data from the user

System.out.println(" Enter first name: ");

fName = sc.next();

System.out.println(" Enter last name: ");

lName = sc.next();

System.out.println(" Enter phone number: ");

pn = sc.next();

System.out.println(" Enter zip code: ");

zp = sc.next();

// Adds the record

pr[record] = new PhoneRecord(fName, lName, pn, zp);

// Increase the record counter

record++;

System.out.println(" 1 record added. Total Records: " + record);

}// End of method

// Method to display all the records

void displayRecords()

{

// Loops till end of records

for(int x = 0; x < record; x++)

{

// Displays record number

System.out.print(x + ". ");

// Displays information

System.out.println(pr[x].firstName + " " + pr[x].lastName + " " + pr[x].phoneNumber + " " + pr[x].zipCode);

}// End of for loop

}// End of method

// Method to display all records with same last name

void displayRecordsWithSameLastName()

{

// Accepts last name from the user

System.out.println(" Enter the last name: ");

lName = sc.next();

// Loops till end of records

for(int x = 0; x < record; x++)

{

// Checks if the last name entered by the user and last name in the phone record are same

if(pr[x].lastName.equalsIgnoreCase(lName))

{

// If same display the information

System.out.println(pr[x].firstName + " " + pr[x].lastName + " " + pr[x].phoneNumber + " " + pr[x].zipCode);

}// End of if condition

}// End of for loop

}// End of method

// Method to display phone number matching with specified first name

void findNumber()

{

// Accept first name from the user

System.out.println(" Enter name to look up:: ");

fName = sc.next();

// Loops till end of records

for(int x = 0; x < record; x++)

{

// Compares first name entered by the user and the first name in the phone record

if(pr[x].firstName.equalsIgnoreCase(fName))

{

// If same display the information

System.out.println(pr[x].firstName + " " + pr[x].lastName + " " + pr[x].phoneNumber + " " + pr[x].zipCode);

}// End of if condition

}// End of while loop

}// End of method

// Method to delete a record based on the phone number entered by the user

void removeNumber()

{

// Initializes flag to zero for record not found

int f = 0, x;

// Accepts phone number from the user

System.out.println(" Enter phone no: ");

pn = sc.next();

// Loops till end of records

for(x = 0; x < record; x++)

{

// Checks if the phone number entered by the user is same as the phone number in phone record

if(pr[x].phoneNumber.equalsIgnoreCase(pn))

{

// Set the flag to one for record found

f = 1;

// Come out of the loop

break;

}// End of if

}// End of for

// Checks if flag value is zero display record not found

if(f == 0)

System.out.println("The phone no do not exist.");

// Otherwise record found

else

{

// Loops till end of records

for(int y = x; y < record; y++)

// Swaps record one position back

pr[y] = pr[y+1];

// Displays message

System.out.print(" Record with phone no: " + pn + " deleted.");

// Decrease the record counter by one

record--;

}// End of else

}// End of method

// Method to delete all the record matching with the zip code entered by the user

void removeNumberWithSameZipCode()

{

// Initializes flag to zero for record not found

int f = 0, x;

// Counter for number of record deleted

int no = 0;

// Accepts zip code from the user

System.out.println(" Enter zip code: ");

zp = sc.next();

// Loops till end of records

for(x = 0; x < record; x++)

{

// Checks if the phone number entered by the user is same as the phone number in phone record

if(pr[x].zipCode.equalsIgnoreCase(zp))

{

// Loops till end of records

for(int y = x; y < record; y++)

// Set the flag to one for record found

pr[y] = pr[y+1];

// Decrease the record counter by one

record--;

// Increase the deleted record counter by one

no++;

// Set the flag to one for record found

f = 1;

}// End of if

}// End of for

// Checks if flag value is zero display record not found

if(f == 0)

System.out.println(" The phone no do not exist.");

// Otherwise record found

else

System.out.println(" No of records deleted: " + no + ". Remaining Records: " + record);

}// End of method

// Main method definition

public static void main(String[] args)

{

// Creates an object of class PhoneDirectory_HW

PhoneDirectory_HW pw = new PhoneDirectory_HW();

// Loops till user enters 'q'

{

// Displays menu

String choice = pw.menu();

// Checks the menu option and calls the appropriate method

if(choice.equalsIgnoreCase("a"))

pw.addNumber();

else if(choice.equalsIgnoreCase("d"))

pw.displayRecords();

else if(choice.equalsIgnoreCase("da"))

pw.displayRecordsWithSameLastName();

else if(choice.equalsIgnoreCase("f"))

pw.findNumber();

else if(choice.equalsIgnoreCase("r"))

pw.removeNumber();

else if(choice.equalsIgnoreCase("rc"))

pw.removeNumberWithSameZipCode();

else if(choice.equalsIgnoreCase("q"))

System.exit(0);

else

System.out.println(" Command was not recognized; please enter only a, d, da, f, r, rc or q. ");

}while(true); // End of do - while

}// End of main method

}// End of method

Sample Run:

Phone directory commands:
a - Add a new phone number
d - Display All
da -Display all with same Last Name
f - Find a phone number
r - Remove a phone number
rc -Remove all records with same zip code
q – Quit
Enter command (a, d, da, f, r, rc or q):
a
Enter first name:
pyari
Enter last name:
sahu
Enter phone number:
123
Enter zip code:
111
1 record added. Total Records: 1

Phone directory commands:
a - Add a new phone number
d - Display All
da -Display all with same Last Name
f - Find a phone number
r - Remove a phone number
rc -Remove all records with same zip code
q – Quit
Enter command (a, d, da, f, r, rc or q):
a
Enter first name:
Ram
Enter last name:
sahu
Enter phone number:
456
Enter zip code:
121
1 record added. Total Records: 2

Phone directory commands:
a - Add a new phone number
d - Display All
da -Display all with same Last Name
f - Find a phone number
r - Remove a phone number
rc -Remove all records with same zip code
q – Quit
Enter command (a, d, da, f, r, rc or q):
a
Enter first name:
Suresh
Enter last name:
padhi
Enter phone number:
783
Enter zip code:
1254
1 record added. Total Records: 3

Phone directory commands:
a - Add a new phone number
d - Display All
da -Display all with same Last Name
f - Find a phone number
r - Remove a phone number
rc -Remove all records with same zip code
q – Quit
Enter command (a, d, da, f, r, rc or q):
r
Enter phone no:
456
Record with phone no: 456 deleted.
Phone directory commands:
a - Add a new phone number
d - Display All
da -Display all with same Last Name
f - Find a phone number
r - Remove a phone number
rc -Remove all records with same zip code
q – Quit
Enter command (a, d, da, f, r, rc or q):
d
0. pyari sahu 123 111
1. Suresh padhi 783 1254

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